Drug interactions
Cefdinir + Sodium picosulfate / magnesium oxide / anhydrous citric acid
Severity: Moderate
Cefdinir and Sodium picosulfate / magnesium oxide / anhydrous citric acid: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Sodium picosulfate is a prodrug activated by colonic bacteria, and antibiotics can suppress this flora. This may reduce the laxative effect and result in inadequate bowel cleansing before colonoscopy. Magnesium-containing products may also reduce cefdinir absorption if taken close together.
What this interaction means in plain words
Cefdinir and Sodium picosulfate / magnesium oxide / anhydrous citric acid can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Antibiotic suppression of colonic bacteria reduces conversion of picosulfate to its active metabolite; the magnesium component can also chelate cefdinir.
What to do
Where possible, avoid starting cefdinir shortly before bowel preparation, and separate cefdinir from the magnesium-containing preparation by at least 2 hours. Confirm adequate bowel cleansing before the procedure.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Cefdinir and Sodium picosulfate / magnesium oxide / anhydrous citric acid, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Cefdinir
- Aluminum hydroxide + Cefdinir Moderate
- Cefdinir + Cholera vaccine Moderate
- Cefdinir + Famotidine Moderate
- Cefdinir + Gentamicin Moderate
- Cefdinir + Microbiota Moderate
- Cefdinir + Nizatidine Moderate
Frequently asked questions
Can I take Cefdinir with Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates the interaction as moderate. Cefdinir and Sodium picosulfate / magnesium oxide / anhydrous citric acid can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Sodium picosulfate is a prodrug activated by colonic bacteria, and antibiotics can suppress this flora. This may reduce the laxative effect and result in inadequate bowel cleansing before colonoscopy. Magnesium-containing products may also reduce cefdinir absorption if taken close together.
How serious is the interaction between Cefdinir and Sodium picosulfate / magnesium oxide / anhydrous citric acid?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Where possible, avoid starting cefdinir shortly before bowel preparation, and separate cefdinir from the magnesium-containing preparation by at least 2 hours. Confirm adequate bowel cleansing before the procedure.
What other medicines interact with Cefdinir?
MediHelp also lists interactions of Cefdinir with, for example, Aluminum hydroxide, Cholera vaccine, Famotidine. The full list is on the Cefdinir page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
